Wind power generator permanent magnet rotor

Abstract

The application discloses a wind power motor permanent magnet rotor, and relates to the technical field of motors, which comprises a rotor support, a plurality of magnetic pole units are uniformly arranged on the outer wall of the rotor support in a circumferential direction, and an inter-pole gap is left between two adjacent magnetic pole units; each magnetic pole unit comprises a permanent magnet, a pole shoe structure, a stud bolt, a fixing piece and a pressing plate; the pole shoe structure is located outside the permanent magnet and is used for pressing the pole shoe structure; the pole shoe structure is composed of a plurality of pole shoe punching sheets and is provided with an axial tension hole; the stud bolt passes through the axial tension hole and is fixed on the pressing plate at the front and rear ends; the pressing plate is located on the axial two sides of the rotor support; and the permanent magnet is fixed on the outer wall of the rotor support by being pressed by the pole shoe structure, the fixing piece and the pressing plate. The wind power motor permanent magnet rotor has the characteristics that the working distance of the permanent magnet is closer, the magnetic flux is denser, the magnetic bridge is replaced by the fixing piece, and weak magnetic or non-magnetic conductive materials are used, so that the utilization efficiency of the permanent magnet is remarkably improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motors, and more particularly to a permanent magnet rotor for a wind turbine motor. Background Art

[0002] Medium-speed permanent magnet semi-direct-drive permanent magnet wind turbines are currently the mainstream approach for offshore wind power. These motors primarily utilize an inner rotor salient pole structure. Since speeds typically range from 200 to 800 rpm, and the rotor poles are embedded within the rotor core, the design of the magnetic isolation bridge is crucial. While maintaining strength, the width of the isolation bridge should be as small as possible. To ensure magnet excitation efficiency, core areas with significant magnetic flux leakage are typically hollowed out. While this method is simple and easy to implement, excessive hollowing is not recommended. High speeds (especially overspeed) can lead to high centrifugal forces on both sides of the isolation bridge, necessitating a sufficient wall thickness based on material properties to prevent the isolation bridge from yielding or fracturing. However, the higher the speed, the wider the isolation bridge, and the greater the impact on magnet efficiency.

[0003] At present, the medium-speed permanent magnet semi-direct drive rotor structure mainly embeds magnets in the pole box, and multiple pole boxes are fastened to the rotor bracket through a large number of bolts. However, this method has a large number of bolts, a large amount of installation work, a long installation cycle, and cumbersome process steps, which increases production costs and is not conducive to mass production of products.

[0004] In addition, there are magnetically saturated materials around the magnet, which makes it impossible to effectively utilize the magnetic flux in the non-working direction, resulting in a low effective utilization rate of the magnetic flux. Summary of the Invention

[0005] In order to overcome the defects existing in the above-mentioned prior art, the present invention discloses a permanent magnet rotor for a wind turbine motor. The purpose of the present invention is to solve the problems existing in the prior art that the medium-speed permanent magnet semi-direct drive rotor structure is mainly composed of magnets embedded in the pole box, and the problem that there are magnetically saturated materials around the magnets.

[0006] In order to achieve the above objectives, the present invention adopts the following technical solutions:

[0007] A permanent magnet rotor for a wind turbine generator comprises a rotor support, wherein a plurality of magnetic pole units are evenly arranged on the outer wall of the rotor support along the circumferential direction, with an interpolar gap between two adjacent magnetic pole units, and each magnetic pole unit comprises a permanent magnet, a pole shoe structure, a stud, a fixing member and a pressure plate;

[0008] The pole shoe structure is located on the outside of the permanent magnet to press the permanent magnet. The pole shoe structure is composed of multiple pole shoe punchings and is provided with an axial tightening hole. The stud passes through the axial tightening hole and the front and rear ends are fixed on the pressure plate. The pressure plate is located on both axial sides of the rotor bracket. The permanent magnet is pressed and fixed on the outer wall of the rotor bracket through the pole shoe structure, the fixing part and the pressure plate.

[0009] Preferably, the rotor support is an outer polygonal and inner circular structure, each side of the outer polygonal is provided with a magnetic pole unit, a plurality of permanent magnets in each magnetic pole unit are in a linear type and the inner end is attached to the outer wall surface of the rotor support, the fixing member is a first pressing strip arranged along the axial direction of the rotor support and located between and separating adjacent two permanent magnets, the top of the first pressing strip is assembled on the pole shoe structure, and the first pressing strip is fixed with the rotor support through a set bolt.

[0010] Preferably, a plurality of first bolt counterbores for accommodating the first pressing strip are arranged on the polygonal surface of the rotor support, the number of the outer polygonal sides of the rotor support is a, and a≥4.

[0011] The first pressing strip is in a circular tail, a pigeon tail or a T tail shape, a plurality of first bolt holes for accommodating are arranged on the non-tail surface of the first pressing strip, and a first bolt is arranged through the first bolt counterbores and assembled on the first bolt holes.

[0012] Preferably, the pole shoe structure is in a trapezoidal or arcuate shape, and a limiting stopper for limiting the permanent magnet is arranged on both sides; the pole shoe structure is made by laminating high-permeability pole shoe punches with a thickness of 0.3mm~1.5mm, and a notch corresponding to the shape of the fixing member is arranged on the pole shoe punch; when the pole shoe structure is in an arcuate shape, the outer diameter of the arc is concentric or eccentric with the rotor support.

[0013] Preferably, a plurality of permanent magnets are arranged, and the plurality of permanent magnets are regularly distributed in the circumferential and axial directions of the rotor support, specifically, the plurality of permanent magnets are uniformly distributed along the circumference of the rotor support in the circumferential direction and are aligned and uniformly distributed along a straight line in the axial direction.

[0014] Preferably, a fastening gap is left between the first pressing strip and the polygonal surface of the rotor support, and the thickness of the fastening gap is 1mm~5mm; in each magnetic pole unit, the number of the permanent magnets is b, and 3≤b≤15.

[0015] Preferably, the outer side of the pressing plate is fixed with the stud fastener, and the inner side is fixed with the rotor support through a support fastener.

[0016] Preferably, the rotor support is made of high-permeability steel material, and the fixing member and the pressing plate are made of weakly magnetic or non-magnetic material.

[0017] Preferably, a sink groove is arranged on the pressing plate to prevent the fixing member from protruding from the end surface of the rotor support and interfering, the sink groove is consistent with the cross-sectional shape of the fixing member, and the two ends of the fixing member are located in the sink groove.

[0018] Preferably, the rotor support is a circular barrel structure, and each magnetic pole unit further comprises a magnetic pole yoke part and a tensioning core rod.

[0019] The magnetic pole yoke part is located on the outer circle of the rotor support, the inner end of the permanent magnet is attached to the magnetic pole yoke part, the magnetic pole yoke part is composed of multiple yoke part stampings and is provided with an axial tension hole, the tension core rod passes through the axial tension hole of the magnetic pole yoke part and is fixed at the front and rear ends of the tension core rod to the pressing plate, and the tension core rod is fixed to the rotor support by means of a threaded bolt.

[0020] Preferably, the tension core rod is rectangular and is provided with multiple second bolt holes, and the rotor support is provided with multiple second bolt countersunk holes, and a second bolt passes through the second bolt countersunk hole and is assembled on the second bolt hole.

[0021] Preferably, the cross-sectional shape of the tension core rod is consistent with the shape of the axial tension hole of the magnetic pole yoke part, and a gap is reserved in the circumferential direction of the axial tension hole of the magnetic pole yoke part, and the gap thickness is ≤0.2mm; the tension core rod is provided with a cylindrical wire port at both axial ends for nut threading, and the tension core rod is made of weak magnetic material.

[0022] Preferably, the fixing part is a second pressing strip arranged in the axial direction of the magnetic pole yoke part, the top of the second pressing strip is assembled on the pole shoe structure, the bottom is assembled on the magnetic pole yoke part, and the pole shoe structure and the magnetic pole yoke part are fixed in the form of a key or a threaded bolt.

[0023] Preferably, the second pressing strip is a combined pressing strip, the combined pressing strip is a combined shape of an upper dove tail-shaped strip and a lower T tail-shaped strip, the upper dove tail-shaped strip and the lower T tail-shaped strip are respectively assembled on the pole shoe structure and the magnetic pole yoke part, and the upper dove tail-shaped strip and the lower T tail-shaped strip are tightened in the form of bolt threading.

[0024] Preferably, the second pressing strip is an integrated shape of an upper dove tail and a lower T tail, and the second pressing strip is provided with a triangular notch on both sides of the lower T tail for keying.

[0025] Preferably, the key is a right triangle, the slope ratio of the key is 1:50~1:200, the thickness of the small end of the key is ≤3mm, the key is welded to the second pressing strip after installation, and the key is made of weak magnetic or non-magnetic material.

[0026] Preferably, the integrated pressing strip is provided with a locking gap on the wall surface of the T-shaped notch of the magnetic pole yoke part and the dove tail-shaped notch of the pole shoe structure, and the thickness of the locking gap is 2mm~5mm.

[0027] Preferably, the inner circle of the magnetic pole yoke part is consistent with the radius of the outer circle of the rotor support, and a T-shaped notch is provided at the inner circle and penetrates in the axial direction, and an outer side is provided with a notch consistent with the permanent magnet, and the magnetic pole yoke part is made of high permeability yoke part stampings with a thickness of 0.3mm~1.5mm by laminating.

[0028] Preferably, the number of permanent magnets in each magnetic pole unit is b, 2≤b≤15.

[0029] Preferably, the outer side of the pressing plate is fixed with the stud by stud fasteners, and the inner side is fixed with the tensioning mandrel by mandrel fasteners.

[0030] Preferably, a plurality of permanent magnets are arranged in each magnetic pole unit, and the plurality of permanent magnets form a permanent magnet combination, the permanent magnet combination is V-shaped, V plus one-shaped or U-shaped, and the fixing member is located between and spaced from two adjacent permanent magnets in the V-shaped or U-shaped permanent magnet combination.

[0031] When the permanent magnet combination is V-shaped, the V-shaped permanent magnet combination is located between the pole shoe structure and the magnetic pole yoke.

[0032] When the permanent magnet combination is V plus one-shaped, the V plus one-shaped permanent magnet combination includes a V-shaped permanent magnet combination and a one-shaped permanent magnet, the V-shaped permanent magnet combination is located between the pole shoe structure and the magnetic pole yoke, and the one-shaped permanent magnet is located in the pole shoe structure.

[0033] When the permanent magnet combination is U-shaped, the U-shaped permanent magnet combination is located between the pole shoe structure and the magnetic pole yoke.

[0034] Preferably, the fixing member is a bracing strip arranged axially along the pole shoe structure, the bracing strip is assembled on the pole shoe structure and extends downward, and the downward extending part is fixed with the magnetic pole yoke by way of a clasp bolt.

[0035] Preferably, the bracing strip is dovetail-shaped, and the number of dovetail-shaped bracing strips in each magnetic pole unit is 2-5.

[0036] The bracing strip is provided with a plurality of third bolt holes for clasp bolts in the downward extending part, the magnetic pole yoke is provided with a plurality of third bolt counterbores, and a third bolt is passed through the third bolt counterbores and assembled in the third bolt holes.

[0037] Preferably, the fixing member is an Ω-shaped tensioning rib arranged axially along the magnetic pole yoke, the closed part of the Ω-shaped tensioning rib is assembled on the magnetic pole yoke, the pole shoe structure is provided with an embedded part adapted to the Ω-shaped tensioning rib, the embedded part is embedded in the opening of the Ω-shaped tensioning rib, and the pole shoe structure is fixed on the magnetic pole yoke.

[0038] Preferably, the axial length of the Ω-shaped tensioning rib extends beyond the pole shoe structure, the single-side extending length is 30-50 mm, the Ω-shaped tensioning rib is in interference fit with the magnetic pole yoke, the interference fit gap is -0.1 mm to -0.3 mm, the magnetic pole yoke is provided with a notch for assembling the Ω-shaped tensioning rib, and the notch reserves an assembly gap.

[0039] The beneficial effects of the present application are:

[0040] 1、The wind power motor permanent magnet rotor provided by the present application solves the problems of the prior art, i.e., the current medium-speed permanent magnet half-direct-drive rotor structure mainly embeds magnetic steel in a magnetic pole box, and a plurality of magnetic pole boxes are combined on a rotor support through a large number of bolts, but the number of bolts is large, the installation operation amount is large, the installation period is long, the process steps are complicated, the production cost is increased, and batch production of products is not facilitated.

[0041] 2、The wind power motor permanent magnet rotor provided by the present application solves the problems of the prior art, i.e., magnetic steel is surrounded by magnetic saturation material, which causes magnetic flux in a non-working direction to be unable to be effectively utilized, thereby causing low effective utilization rate of magnetic flux.

[0042] 3、The wind power motor permanent magnet rotor provided by the present application has a plurality of forms for the permanent magnet, one of which is a one-word permanent magnet combination without a magnetic pole yoke, and the other of which is a V-shaped permanent magnet combination, a V-plus-one permanent magnet combination, a U-shaped permanent magnet combination, and the like.

[0043] The one-word permanent magnet combination has the advantages of simple process, easy processing and assembly, low cost, and easy division into small blocks.

[0044] The V-shaped permanent magnet combination can adjust the angle of V to achieve desired magnetic field distribution, so that the angle can be adjusted to optimize the harmonics generated by the motor and reduce torque ripple.

[0045] V plus one type permanent magnet combination: equivalent to adding an auxiliary permanent magnet on the basis of V type, the structure magnetic field adjustment flexible (can through the auxiliary magnetic steel to enhance or weaken the main magnetic field, broaden the speed range), but the structure compared to V more complex, higher cost.

[0046] U type permanent magnet combination: magnetic bridge prevents magnetic leakage, and the U type structure can form self-shielding effect (equivalent to two sides offset), reduce the magnetic leakage (offset, no run out, no run out, magnetic loop, no loop, no loss), thereby reducing the eddy current loss.

[0047] 4, the wind power generator permanent magnet rotor provided by the application has various forms of fixed parts, including bolt joint type pressing strip, key type pressing strip, combined type pressing strip, integral type pressing strip and omega type tension bar, and each form of pressing strip has the following advantages:

[0048] The bolt joint type pressing strip is flexible in assembly, convenient to disassemble and maintain, easy to adjust (contact pressure is controlled through bolt pre-tightening force, reducing the risk of loosening), and has wide adaptability (suitable for installation of various sizes).

[0049] The key type pressing strip is strong in centrifugal force resistance (keys transmit tangential force, suitable for high speed), simple in structure (without complex fasteners, low cost), and high in reliability (not easy to loosen, suitable for long-term operation). However, stress concentration is easy to occur, and the key is not easy to adjust the position of the magnetic yoke.

[0050] The combined type pressing strip has strong redundancy and the advantages of flexibility of bolts and stress resistance of pressing strips, thereby reducing the risk of failure. However, the structure is complex and the assembly is complicated.

[0051] The integral type pressing strip is stronger in rigidity (high mechanical strength) and simple in structure, and is good in centrifugal force resistance and vibration resistance.

[0052] The omega type tension bar is good in load sharing effect (tension bar uniformly distributes centrifugal force, reducing local stress), and the uniform stress reduces vibration and noise. No need to open holes to affect the strength of the rotor.

[0053] 5, the wind power generator permanent magnet rotor provided by the application has the characteristics of closer working distance of permanent magnets, denser magnetic flux, replacing the magnetic bridge with a fixed part and using weak magnetic or non-magnetic material, so that the utilization efficiency of the permanent magnet can be significantly improved. BRIEF DESCRIPTION OF DRAWINGS

[0054] Figure 1 Fig. 1 is a schematic view of a rotor structure of the application using a linear permanent magnet;

[0055] Figure 2 Fig. 2 is a schematic view of a rotor support structure of the application with a polygonal shape outside and a circular shape inside;

[0056] Figure 3 for the invention Figure 1 a cross-sectional view of the invention;

[0057] Figure 4 for the invention

[0058] Figure 5 for the invention

[0059] Figure 6 for the invention

[0060] Figure 7 for the invention

[0061] Figure 8 for the invention

[0062] Figure 9 for the invention

[0063] Figure 10 for the invention

[0064] Figure 11 for the invention

[0065] Figure 12 for the invention

[0066] Figure 13 for the invention

[0067] Figure 14 for the invention

[0068] Figure 15 for the invention Figure 13 a cross-sectional view of the invention;

[0069] Figure 16 for the invention

[0070] Figure 17 for the invention

[0071] Figure 18 for the invention

[0072] Figure 19The structure diagram of the pressing plate corresponding to the combined pressing strip of the application;

[0073] Figure 20 The partial enlarged view of the rotor of the application adopting the V-shaped permanent magnet combination and the integral pressing strip;

[0074] Figure 21 The structure diagram of the integral pressing strip of the application;

[0075] Figure 22 The structure diagram of the key of the application;

[0076] Figure 23 The structure diagram of the pressing plate corresponding to the integral pressing strip of the application;

[0077] Figure 24 The structure diagram of the rotor of the application adopting the V plus one type permanent magnet combination;

[0078] Figure 25 The cross-sectional structure diagram of the application; Figure 24

[0079] Figure 26 The partial enlarged view of the rotor of the application adopting the V plus one type permanent magnet combination;

[0080] Figure 27 The structure diagram of the rotor of the application adopting the U-shaped permanent magnet combination;

[0081] Figure 28 The partial enlarged view of the rotor of the application adopting the U-shaped permanent magnet combination;

[0082] Figure 29 The overall shape of the magnetic pole of the rotor of the application adopting the U-shaped permanent magnet combination;

[0083] Figure 30 The structure diagram of the dovetail-shaped stay of the application;

[0084] Figure 31 The structure diagram of the pressing plate corresponding to the dovetail-shaped stay of the application;

[0085] Figure 32 The structure diagram of the rotor of the application adopting the V-shaped permanent magnet combination and the omega-shaped tensioning rib;

[0086] Figure 33 The partial enlarged view of the rotor of the application adopting the V-shaped permanent magnet combination and the omega-shaped tensioning rib;

[0087] Figure 34 The partial enlarged view of the assembly position of the omega-shaped tensioning rib of the application;

[0088] Figure 35 The structure diagram of the pole shoe corresponding to the omega-shaped tensioning rib of the application;​

[0089] Figure 36 Fig. 1 is a schematic view of an Ω-shaped tensioning structure of the present application;

[0090] Figure 37 Fig. 2 is a schematic view of a corresponding pressing plate structure of the Ω-shaped tensioning structure of the present application;

[0091] Reference signs:

[0092] 1, rotor support; 2, permanent magnet; 3, pole shoe structure; 4, stud bolt; 5, fixing member; 6, pressing plate; 7, pole yoke; 8, tensioning core rod; 9, key. DETAILED DESCRIPTION

[0093] The concept, specific structure and technical effects of the present application will be described clearly and completely in combination with the embodiments and the drawings, so as to fully understand the purpose, features and effects of the present application.

[0094] A wind power generator permanent magnet rotor, as shown in Fig. 1, comprises a rotor support 1, a plurality of magnetic pole units are uniformly arranged on the outer wall of the rotor support 1 in the circumferential direction, and an inter-pole gap is left between two adjacent magnetic pole units. Each magnetic pole unit comprises a permanent magnet 2, a pole shoe structure 3, a stud bolt 4, a fixing member 5 and a pressing plate 6. Figures 1-37 The pole shoe structure 3 is located outside the permanent magnet 2 and presses the permanent magnet 2, the pole shoe structure 3 is composed of a plurality of pole shoe stamping pieces and is provided with an axial tensioning hole, the stud bolt 4 passes through the axial tensioning hole and is fixed on the pressing plate 6 at the front and rear ends, the pressing plate 6 is located on the axial two sides of the rotor support 1, and the permanent magnet 2 is pressed and fixed on the outer wall of the rotor support 1 through the pole shoe structure 3, the fixing member 5 and the pressing plate 6.

[0095] In the embodiment, the rotor support 1 is used for installing the magnetic pole unit, the permanent magnet 2 can be a magnetic steel and is used for being fastened to generate a main magnetic circuit to work; the pole shoe structure 3 is used for pressing the permanent magnet 2; the stud bolt 4 is used for pressing the pole shoe structure 3; the fixing member 5 is used for fixing the pole shoe structure 3 and further fixing the permanent magnet 2; and the pressing plate 6 is used for assisting in fixing the permanent magnet 2.

[0096] As a preferred embodiment of the present application, as shown in Figs. 3 and 4, the rotor support 1 is in an outer polygonal shape and an inner circular shape structure, one magnetic pole unit is arranged on each face of the outer polygonal shape, a plurality of permanent magnets 2 in each magnetic pole unit are in a linear type and the inner ends thereof are attached to the outer wall of the rotor support 1, the fixing member 5 is a first pressing strip arranged along the axial direction of the rotor support 1 and is located between and separates the adjacent two permanent magnets, the top of the first pressing strip is assembled on the pole shoe structure 3, and the first pressing strip is fixed to the rotor support 1 through a set screw.

[0097] Figure 1 Figure 2 Figure 3 The first pressing strip is arranged along the axial direction of the rotor support 1 and is located between and separates the adjacent two permanent magnets, the top of the first pressing strip is assembled on the pole shoe structure 3, and the first pressing strip is fixed to the rotor support 1 through a set screw. ​​​

[0098] As Figure 1 , Figure 4 , Figure 7 , Figure 10 shown, the three permanent magnets 2 are in a linear type, the inner ends of the three permanent magnets 2 are attached to the rotor support 1, and the outer ends are attached to the pole shoe structure 3. The pole shoe structure 3 is fixed to the rotor support 1 through the first pressing strip, and the permanent magnet 2 is fixed on the rotor support 1. For this linear permanent magnet type rotor, the process is simple, easy to process and assemble, so the cost is low, and it is easy to be divided into small pieces (divided into small pieces, which is equivalent to the short magnetic leakage path, less road, and naturally less energy consumption), which also reduces the magnetic leakage.

[0099] As a preferred embodiment of the present embodiment, as shown in Figure 2 , a plurality of first bolt counterbores for the first pressing strip are provided on the polygonal surface of the rotor support 1, and the number of outer polygonal edges of the rotor support 1 is a, a≥4;

[0100] As Figure 4 , Figure 5 , Figure 7 , Figure 8 , Figure 10 and Figure 11 shown, the first pressing strip is shaped as a round tail, a pigeon tail or a T tail and is embedded in the corresponding groove of the pole shoe structure 3, and a plurality of first bolt holes for assembly are provided on the non-tail surface of the first pressing strip. The first bolt passes through the first bolt counterbore and is assembled on the first bolt hole to tension the first pressing strip, and the first pressing strip further presses the permanent magnet 2.

[0101] As a preferred embodiment of the present embodiment, as shown in Figure 4 , Figure 7 , Figure 10 , Figure 16 , Figure 20 , Figure 26 , Figure 28 shown, the pole shoe structure 3 is shaped as a trapezoidal or arcuate shape, and a limiting stop is provided on both sides to limit the permanent magnet 2; the pole shoe structure 3 is made of high-permeability pole shoe stamping with a thickness of 0.3mm~1.5mm by laminating, and a notch corresponding to the shape of the fixing member 5 is provided on the pole shoe stamping to install the fixing member 5; when the pole shoe structure 3 is in an arcuate shape, the outer diameter of the arc is concentric or eccentric with the rotor support 1.

[0102] As a preferred embodiment of the present embodiment, the permanent magnets 2 are provided in plurality, and the plurality of permanent magnets 2 are regularly distributed in the circumferential direction and the axial direction of the rotor support 1, specifically, are evenly distributed along the circumference of the rotor support 1 in the circumferential direction, and are aligned along a straight line and evenly distributed in the axial direction. With this arrangement of permanent magnets, the magnetic field distribution is more uniform. The circumferential uniform distribution ensures that the air gap magnetic density is close to a sine wave, reducing the harmonic content, thereby reducing motor torque ripple and noise, and improving motor stability. The axial alignment can reduce the circumferential unbalanced magnetic pull; the centrifugal force is evenly distributed.

[0103] As a preferred embodiment of the present embodiment, a fastening gap is left between the first pressing strip and the polygonal surface of the rotor support 1, and the thickness of the fastening gap is 1mm-5mm. Without the gap, the tie strip is directly next to the rotor support, so the fastening bolt is useless, and the tie strip is dead. With the gap, the fastening bolt can pull the tie strip, and the tie strip can be tightened. In each magnetic pole unit, the number of permanent magnets 2 is b, and 3≤b≤15.

[0104] As a preferred embodiment of the present embodiment, as shown in Figure 1 , the outer side of the pressing plate 6 is fixed with the stud fastener and the double-headed stud 4, and the inner side is fixed with the support fastener and the rotor support 1. The support fastener can be a bolt, i.e. the pressing plate 6 is fixed on the rotor support 1 by a bolt, and then the pole shoe structure 3 is fixed on the pressing plate 6 by the double-headed stud 4, and then the pole shoe structure 3 and the rotor support 1 are fixed by the pressing plate 6, so that the permanent magnet 2 and the rotor support 1 are fixed by the pressing plate 6.

[0105] As a preferred embodiment of the present embodiment, the rotor support 1 is made of high-permeability steel material, and the fixing member 5 and the pressing plate 6 are made of weakly magnetic or non-magnetic material. The permanent magnet 2 is pressed by the pole shoe structure 3 in the radial direction, and is also fixed in the axial direction by the pressing plate 6. The use of weakly magnetic or non-magnetic material also prevents magnetic leakage. If the pressing plate 6 does not use weakly magnetic material, the permanent magnets at both ends will leak magnetic flux in the axial direction.

[0106] As a preferred embodiment of the present embodiment, as shown in Figure 6 , Figure 9 , Figure 12 , Figure 19 , Figure 23 , Figure 31 , Figure 37 , a sink groove is opened on the pressing plate 6 to prevent the fixing member 5 from protruding beyond the end surface of the rotor support 1 and interfering. The sink groove is consistent with the cross-sectional shape of the fixing member 5, and the two ends of the fixing member 5 are located in the sink groove.

[0107] As a preferred embodiment of the present embodiment, as shown in Figure 13 , Figure 14 , Figure 24 , Figure 27 , Figure 32As shown, the rotor support 1 is a circular barrel structure, and each magnetic pole unit further comprises a magnetic pole yoke 7 and a tensioning core rod 8.

[0108] The magnetic pole yoke 7 is located on the outer circle of the rotor support 1, and the inner end of the permanent magnet 2 is attached to the magnetic pole yoke 7. The magnetic pole yoke 7 is composed of multiple yoke punching sheets and is provided with an axial tensioning hole. The tensioning core rod 8 passes through the axial tensioning hole of the magnetic pole yoke 7 and is fixed at the pressing plate 6 at the front and rear ends. The tensioning core rod 8 is fixed to the rotor support 1 by means of a joint bolt.

[0109] In this embodiment, the magnetic pole yoke 7 is used to mount permanent magnets such as V-shaped permanent magnet combinations and U-shaped permanent magnet combinations. For example, for a V-shaped permanent magnet combination, the V-shaped structure used here must be designed to fit the angle. If the magnetic pole yoke is not used, the rotor support must be opened to a V-shaped groove to mount the permanent magnet, which will result in an excessively thick rotor support. In addition, the eddy current loss generated by the permanent magnet is proportional to the thickness of the rotor support. Therefore, the magnetic pole yoke is adopted in the form of punching sheets, which not only completely fits the V-shaped structure but also has low eddy current loss. The magnetic pole yoke 7 provides mechanical fixation and protection for the permanent magnet, preventing the permanent magnet from being displaced or damaged due to centrifugal force or impact. As part of the magnetic circuit, the magnetic pole yoke can efficiently guide the magnetic flux and reduce the magnetic leakage. The tensioning core rod 8 is used to tension the magnetic pole yoke 7 and is combined with the joint bolt to fix the magnetic pole yoke 7 to the rotor support 1.

[0110] As a preferred embodiment of the present embodiment, as shown in Figure 18 As shown, the tensioning core rod 8 is rectangular and is provided with multiple second bolt holes; as shown in Figure 14 As shown, the rotor support 1 is provided with multiple second bolt countersunk holes; as shown in Figure 16 , Figure 20 , Figure 26 , Figure 28 , Figure 33 As shown, the second bolt passes through the second bolt countersunk hole and is assembled on the second bolt hole to fix the tensioning core rod 8 to the rotor support 1, and further fix the magnetic pole yoke 7 to the rotor support 1.

[0111] As a preferred embodiment of the present embodiment, the cross-sectional shape of the tensioning core rod 8 is consistent with the shape of the axial tensioning hole of the magnetic pole yoke 7, and a gap is reserved in the circumferential direction between the tensioning core rod 8 and the axial tensioning hole of the magnetic pole yoke 7, and the thickness of the gap is ≤0.2mm; the axial both ends of the tensioning core rod 8 are provided with cylindrical thread holes for nut jointing; and the tensioning core rod 8 is made of weak magnetic material.

[0112] In this embodiment, the tensioning core rod 8 is rectangular and is assembled in the rectangular axial tensioning hole of the pole yoke part 7, and rotation of the tensioning core rod 8 is limited, so that the second bolt holes on the tensioning core rod 8 are aligned with the second bolts. The tensioning core rod 8 is pre-leaved with a gap in the circumferential direction with the axial tensioning hole of the pole yoke part 7, so as to pull the tensioning core rod 8 to be fixed, and if the gap is not left, it is in the dead state, resulting in that the second bolt is not used.

[0113] As a preferred embodiment of the present embodiment, as shown in Figure 13 , Figure 16 , Figure 20 , Figure 24 , Figure 26 , the fixing part 5 is a second pressing strip arranged in the axial direction of the pole yoke part 7, the top of the second pressing strip is assembled on the pole shoe structure 3, the bottom is assembled on the pole yoke part 7, and the pole shoe structure 3 and the pole yoke part 7 are fixed in the form of a key 9 or a bolt.

[0114] Among them, the form of the key 9 is strong against centrifugal force (the key transmits tangential force, suitable for high speed), simple structure (no need for complex fasteners, lower cost), high reliability (not easy to loosen, suitable for long-term operation). But it is easy to stress concentration, and the key is not easy to adjust the position of the yoke.

[0115] The form of the bolt is flexible in assembly, convenient for disassembly and maintenance, easy to adjust (control the contact pressure by the bolt pre-tightening force, reduce the risk of loosening), and has wide adaptability (suitable for installation of various sizes).

[0116] As a preferred embodiment of the present embodiment, as shown in Figure 16 , Figure 17 , the second pressing strip is a combined pressing strip, the combined pressing strip is a combined shape of an upper dove tail shape and a lower T tail shape, the upper dove tail shape and the lower T tail shape are assembled on the pole shoe structure 3 and the pole yoke part 7 respectively, and the upper dove tail shape and the lower T tail shape are tightened in the form of bolt joint. When the combined pressing strip is used, the redundancy is strong, and the advantages of the bolt flexibility and the stress resistance of the pressing strip are combined, reducing the risk of failure. It is just a little more complex structure and assembly.

[0117] As a preferred embodiment of the present embodiment, as shown in Figure 20 , Figure 21 , the second pressing strip is an integral shape of the upper dove tail and the lower T tail, and triangular notches for the key 9 are provided on the axial both sides of the lower T tail of the second pressing strip. When the integral pressing strip is used, the rigidity of such pressing strip is stronger (high mechanical strength), the structure is simple, and the resistance to centrifugal force and vibration is good.

[0118] As a preferred embodiment of the present embodiment, as shown in Figure 22As shown, the key 9 adopts a right triangle, the slope ratio of the key 9 is 1:50~1:200, the small end thickness of the key 9 is ≤3mm, the key 9 is welded with the second pressing strip after installation, and the key 9 is made of weak magnetic or non-magnetic material. In this embodiment, the weak magnetism prevents magnetic leakage, and the key has the advantage that the length of the key is not long, which is equivalent to leaving only two ends of the position for the key, and the middle is air, and the air has a stronger anti-magnetic leakage effect than the weak magnetic material.

[0119] As a preferred embodiment of the present embodiment, as shown in Figure 20 As shown, the locking gap with a thickness of 2mm~5mm is left on the T-shaped notch wall surface of the magnetic pole yoke part 7 and the dove tail-shaped notch wall surface of the pole shoe structure 3.

[0120] As a preferred embodiment of the present embodiment, as shown in Figure 16 、 Figure 20 、 Figure 26 、 Figure 28 、 Figure 33 As shown, the inner circle of the magnetic pole yoke part 7 is consistent with the outer circle of the rotor support 1, and a T-shaped notch penetrating in the axial direction is opened at the inner circle, the T-shaped notch is used for installing the tensioning core rod 8 and the second bolt, a notch consistent with the permanent magnet 2 is opened on the outer side of the magnetic pole yoke part 7 to facilitate the installation of the permanent magnet 2, and the magnetic pole yoke part 7 is made of a high-permeability yoke part stamping piece with a thickness of 0.3mm~1.5mm through lamination.

[0121] As a preferred embodiment of the present embodiment, as shown in Figure 16 、 Figure 20 、 Figure 26 、 Figure 28 、 Figure 33 As shown, in each magnetic pole unit, the number of the permanent magnets 2 is b, and 2≤b≤15.

[0122] As a preferred embodiment of the present embodiment, as shown in Figure 13 、 Figure 24 、 Figure 27 、 Figure 32 As shown, the outer side of the pressing plate 6 is fixed with the stud bolt 4 through the stud fastener, and the inner side is fixed with the tensioning core rod 8 through the core rod fastener. That is, the stud bolt 4 and the tensioning core rod 8 are fixed together through the pressing plate 6, and then the pole shoe structure 3 connected with the stud bolt 4 and the magnetic pole yoke part 7 connected with the tensioning core rod 8 are fixed together.

[0123] As a preferred embodiment of the present embodiment, a plurality of permanent magnets 2 are arranged in each magnetic pole unit, the plurality of permanent magnets 2 form a permanent magnet combination, the permanent magnet combination is V-shaped, V plus one-shaped or U-shaped, and the fixing piece 5 is located between and separates the adjacent two permanent magnets in the V-shaped or U-shaped permanent magnet combination.

[0124] As shown in Figure 13 ,Figure 15 、 Figure 16 、 Figure 20 As shown, when the permanent magnet combination is V-shaped, the V-shaped permanent magnet combination is located between the pole shoe structure 3 and the pole yoke 7 .

[0125] For V-shaped permanent magnet combined rotors, the angle of V can be adjusted at will to achieve the desired magnetic field distribution, so the harmonics generated by the motor can be optimized and torque pulsation can be reduced by adjusting the angle.

[0126] like Figure 24 、 Figure 25 、 Figure 26 As shown, when the permanent magnet combination is a V plus one type, the V plus one type permanent magnet combination includes a V-type permanent magnet combination and a type one permanent magnet. The V-type permanent magnet combination is located between the pole shoe structure 3 and the pole yoke 7, and the type one permanent magnet is located inside the pole shoe structure 3.

[0127] The V-plus-I permanent magnet combination rotor features: it significantly increases the pole body flux density, helping to improve the pole shoe flux distribution or the air gap flux distribution; it uses a fixed part made of weak magnetic or non-magnetic material to hold the five pairs of V-shaped permanent magnets and the I permanent magnets together, reducing magnetic leakage while also alleviating the centrifugal force that the existing yoke side magnetic isolation bridge must withstand. Although the magnetic isolation bridge is retained on the outermost side, it only withstands the centrifugal force of the I permanent magnet, which is much smaller, allowing the magnetic isolation bridge to be thinner.

[0128] The V plus one permanent magnet combination rotor is equivalent to adding an auxiliary permanent magnet to the V shape. The magnetic field of this structure is flexible (the main magnetic field can be enhanced or weakened by auxiliary magnets to widen the speed regulation range), but the structure is more complex and more expensive than the V.

[0129] like Figure 27 、 Figure 28 、 Figure 29 As shown, when the permanent magnet combination is U-shaped, the U-shaped permanent magnet combination is located between the pole shoe structure 3 and the pole yoke 7 .

[0130] For the U-shaped permanent magnet combined rotor, the magnetic isolation bridge prevents magnetic leakage, and the U-shaped structure can form a self-shielding effect (equivalent to the offsetting of the two sides), reducing magnetic leakage (if it is offset, nothing will escape, and if it does not escape, the magnetism will not form a loop, and if there is no loop, there will be no loss), thereby reducing eddy current loss.

[0131] As a preferred implementation of this embodiment, Figure 27 、 Figure 28 As shown, the fixing member 5 is a pull rod arranged axially along the pole shoe structure 3. The pull rod is assembled on the pole shoe structure 3 and extends downward. The downward extending portion is fixed to the magnetic pole yoke 7 by means of a bolt.

[0132] As a preferred embodiment of the present embodiment, as shown in Figure 30 The tie rods are dove tail shaped, and the number of dove tail shaped tie rods in each magnetic pole unit is 2-5.

[0133] The tie rods are dove tail shaped, and the number of dove tail shaped tie rods in each magnetic pole unit is 2-5.

[0134] As shown in Figure 27 , Figure 28 The tie rods are used to fix the pole shoe structure 3 on the magnetic pole yoke 7, and the same, the tie rods are at the middle position and are made of weak magnetic material, so that the magnetic flux in the non-working direction cannot form a loop at the middle position, but only in the working direction, thereby improving the utilization rate and reducing the loss.

[0135] As a preferred embodiment of the present embodiment, as shown in Figure 32 , Figure 33 , Figure 34 , Figure 35 , Figure 36 The fixing member 5 is an Ω-shaped tension bar arranged along the axial direction of the magnetic pole yoke 7, the closed part of the Ω-shaped tension bar is assembled on the magnetic pole yoke 7, the pole shoe structure 3 is provided with an embedded part matched with the Ω-shaped tension bar, and the embedded part is embedded in the opening of the Ω-shaped tension bar, thereby fixing the pole shoe structure 3 on the magnetic pole yoke 7.

[0136] In the present embodiment, the Ω-shaped tension bar is used to fix the pole shoe structure 3 on the magnetic pole yoke 7, and the structure can lock the pole shoe structure 3 and the magnetic pole yoke 7 by the tension of the Ω-shaped tension bar only, which is simple in structure and convenient to assemble. The tension bar is in the middle of the magnetic pole and has a small thickness, and is made of weak magnetic and non-magnetic material, so that the utilization rate of the magnetic steel is significantly improved. Under the action of the centrifugal force of the motor, it will be more tightly fastened, and the speed adaptation range is wide.

[0137] As a preferred embodiment of the present embodiment, the axial length of the Ω-shaped tension bar extends out of the pole shoe structure 3, and the single-side extension length is 30-50 mm. The Ω-shaped tension bar is in interference fit with the magnetic pole yoke 7, and the interference fit gap is-0.1 mm--0.3 mm, so as to ensure that the Ω-shaped tension bar does not loosen with the magnetic pole yoke 7, otherwise, after being embedded in the pole shoe structure 3, it cannot be locked by tension, which is equivalent to that after the tension is released, there is no interference amount of the tension bar, and there are gaps between the tension bar and the pole shoe structure 3 and the magnetic pole yoke 7, and serious vibration will occur when the motor is running.

[0138] The magnetic pole yoke 7 is provided with a notch for assembling the Ω-shaped tension bar, as shown in Figure 34As shown, the gap reserves assembly clearance. The Ω-shaped tensioning wire is assembled into the pole yoke part 7 (at this time only the tensioning wire is very easy to assemble), and the assembled tensioning wire will be squeezed to both sides of the gap of the pole yoke part 7 due to the existence of tension to release the tension, so that the embedding space becomes smaller, at this time it is very difficult to directly embed the pole shoe structure 3, so it is necessary to reserve assembly clearance at the three positions where the tensioning wire is most easily released. In this way, when the pole shoe structure 3 is embedded, the tensioning wire can be compressed to the reserved assembly clearance, so that the embedding space increases, so that the pole shoe structure 3 can be easily embedded, and after the embedding is completed, the tensioning wire needs to release the compression tension by releasing to both sides to achieve the locking purpose.

[0139] The above describes the embodiments of the present application, but the present application is not limited to the above-described embodiments, and those skilled in the art can make various equivalent modifications or replacements without departing from the spirit of the present application, and these equivalent modifications or replacements are all included in the scope defined by the claims of the present application.

Claims

1. A permanent magnet rotor for a wind turbine, characterized in that: The invention comprises a rotor support (1), wherein a plurality of magnetic pole units are evenly arranged on the outer wall of the rotor support (1) along the circumferential direction, an interpolar gap is left between two adjacent magnetic pole units, and each magnetic pole unit comprises a permanent magnet (2), a pole shoe structure (3), a stud (4), a fixing member (5) and a pressure plate (6); The pole shoe structure (3) is located outside the permanent magnet (2) to press the permanent magnet (2), the pole shoe structure (3) is composed of a plurality of pole shoe punchings and is provided with an axial tightening hole, the stud (4) passes through the axial tightening hole and is fixed to a pressure plate (6) at its front and rear ends, the pressure plate (6) is located on both axial sides of the rotor bracket (1), and the permanent magnet (2) is pressed and fixed to the outer wall of the rotor bracket (1) through the pole shoe structure (3), the fixing member (5) and the pressure plate (6); The rotor support (1) is a structure with an outer polygon and an inner circle, and a magnetic pole unit is provided on each face of the outer polygon. A plurality of permanent magnets (2) in each magnetic pole unit are in a straight line shape and the inner end is in contact with the outer wall surface of the rotor support (1). The fixing member (5) is a first pressure strip arranged along the axial direction of the rotor support (1) and is located between two adjacent permanent magnets to separate the two adjacent permanent magnets. The top of the first pressure strip is assembled on the pole shoe structure (3), and the first pressure strip is fixed to the rotor support (1) by a bolt. The fixing member (5) is made of a weak magnetic or non-magnetic material. Alternatively, the rotor support (1) is a circular barrel-shaped structure, and each magnetic pole unit further comprises a magnetic pole yoke (7) and a tensioning core rod (8); The magnetic pole yoke (7) is located on the outer circle of the rotor bracket (1), the inner end of the permanent magnet (2) is in contact with the magnetic pole yoke (7), the magnetic pole yoke (7) is composed of a plurality of yoke punchings and is provided with an axial tightening hole, the tightening core rod (8) passes through the axial tightening hole of the magnetic pole yoke (7) and the front and rear ends are fixed on the pressure plate (6), and the tightening core rod (8) is fixed to the rotor bracket (1) by a bolt; The fixing member (5) is a second pressure strip arranged axially along the magnetic pole yoke portion (7), the top of the second pressure strip is assembled on the pole shoe structure (3), and the bottom is assembled on the magnetic pole yoke portion (7), and the pole shoe structure (3) and the magnetic pole yoke portion (7) are fixed in the form of a key (9), and the key (9) is made of weak magnetic or non-magnetic material; A plurality of permanent magnets (2) are provided in each magnetic pole unit, the plurality of permanent magnets (2) forming a permanent magnet combination, the permanent magnet combination being V-shaped, V+1-shaped or U-shaped, and the fixing member (5) being located between two adjacent permanent magnets in the V-shaped or U-shaped permanent magnet combination to separate the two adjacent permanent magnets.

2. A permanent magnet rotor for a wind turbine according to claim 1, characterized in that: A plurality of first bolt countersunk holes for engaging the first pressure strip are provided on the polygonal surface of the rotor bracket (1); the number of sides of the outer polygon of the rotor bracket (1) is a, and a≥4; The first pressure strip has a round tail, a dove tail or a T-tail shape, and a plurality of first bolt holes for engagement are opened on the non-tail surface of the first pressure strip, and the first bolt passes through the first bolt countersunk hole and is assembled on the first bolt hole.

3. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: The pole shoe structure (3) is trapezoidal or arcuate in shape, and is provided with stoppers on both sides for limiting the position of the permanent magnet (2); the pole shoe structure (3) is made by laminating high-magnetic-conductivity pole shoe punching sheets with a thickness of 0.3 mm to 1.5 mm, and a notch corresponding to the shape of the fixing member (5) is opened on the pole shoe punching sheet; when the pole shoe structure (3) is arcuate, the outer diameter of the arcuate arc is concentric or eccentric with the rotor bracket (1).

4. A permanent magnet rotor for a wind turbine according to claim 1, characterized in that: A plurality of permanent magnets (2) are provided, and the plurality of permanent magnets (2) are regularly distributed in the circumferential and axial directions of the rotor support (1), specifically: uniformly distributed along the circumference of the rotor support (1) in the circumferential direction, and aligned and uniformly distributed along a straight line in the axial direction.

5. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: A fastening gap is left between the first pressure strip and the polygonal surface of the rotor support (1), and the thickness of the fastening gap is 1 mm to 5 mm; in each magnetic pole unit, the number of the permanent magnets (2) is b, 3≤b≤15.

6. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: The outer side of the pressure plate (6) is fixed to the stud bolt (4) via a stud fastener, and the inner side is fixed to the rotor bracket (1) via a bracket fastener.

7. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: The rotor bracket (1) is made of high-magnetic-conductivity steel, and the pressing plate (6) is made of weak-magnetic or non-magnetic-conductivity material.

8. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: The pressure plate (6) is provided with a recessed groove to prevent the fixing member (5) from extending out of the end face of the rotor bracket (1) and interfering therewith. The recessed groove has the same cross-sectional shape as the fixing member (5), and both ends of the fixing member (5) are located in the recessed groove.

9. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: The tensioning mandrel (8) is rectangular and is provided with a plurality of second bolt holes. The rotor bracket (1) is provided with a plurality of second bolt countersunk holes. The second bolts pass through the second bolt countersunk holes and are assembled on the second bolt holes.

10. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: The cross-sectional shape of the tensioning core rod (8) is consistent with the shape of the axial tensioning hole of the magnetic pole yoke (7), and a gap is reserved with the axial tensioning hole of the magnetic pole yoke (7) in the circumferential direction, and the gap thickness is ≤0.2mm; the tensioning core rod (8) has columnar thread openings for nut engagement at both axial ends, and the tensioning core rod (8) is made of weak magnetic material.

11. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: The second pressure strip is a combined pressure strip, which is a combination of an upper dove-tail strip and a lower T-tail strip. The upper dove-tail strip and the lower T-tail strip are respectively assembled on the pole shoe structure (3) and the magnetic pole yoke (7). The upper dove-tail strip and the lower T-tail strip are tightened in the form of bolts.

12. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: The second pressure strip is in the shape of an upper dove tail and a lower T-tail, and triangular notches for keying (9) are provided on both sides of the lower T-tail axis of the second pressure strip.

13. A permanent magnet rotor for a wind turbine according to claim 12, characterized in that: The key (9) is a right triangle, the slope ratio of the key (9) is 1:50-1:200, the thickness of the small end of the key (9) is ≤3 mm, and the key (9) is welded to the second pressure strip after installation.

14. The permanent magnet rotor of a wind turbine according to claim 12, characterized in that: A locking gap is left between the integrated pressure strip and the T-shaped notch wall of the magnetic pole yoke (7) and the dove-tail-shaped notch wall of the pole shoe structure (3), and the locking gap has a thickness of 2 mm to 5 mm.

15. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: The inner circle of the magnetic pole yoke (7) is consistent with the radius of the outer circle of the rotor bracket (1), and a T-shaped notch is opened on the inner circle and runs through the inner circle in the axial direction. A notch is opened on the outer side and is consistent with the permanent magnet (2). The magnetic pole yoke (7) is made by laminating high-magnetic permeability yoke punching sheets with a thickness of 0.3 mm to 1.5 mm.

16. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: In each magnetic pole unit, the number of the permanent magnets (2) is b, 2≤b≤15.

17. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: The outer side of the pressure plate (6) is fixed to the stud bolt (4) via a stud fastener, and the inner side is fixed to the tensioning core rod (8) via a core rod fastener.

18. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: When the permanent magnet combination is V-shaped, the V-shaped permanent magnet combination is located between the pole shoe structure (3) and the pole yoke portion (7); When the permanent magnet combination is a V plus one type, the V plus one type permanent magnet combination includes a V-type permanent magnet combination and a type one permanent magnet, the V-type permanent magnet combination is located between the pole shoe structure (3) and the pole yoke portion (7), and the type one permanent magnet is located within the pole shoe structure (3); When the permanent magnet combination is U-shaped, the U-shaped permanent magnet combination is located between the pole shoe structure (3) and the magnetic pole yoke portion (7).

19. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: The fixing member (5) is a pull bar arranged axially along the pole shoe structure (3); the pull bar is assembled on the pole shoe structure (3) and extends downward; the downward extending portion is fixed to the magnetic pole yoke (7) by means of a bolt.

20. The permanent magnet rotor of a wind turbine according to claim 19, characterized in that: The brace is dove-tail shaped, and in each magnetic pole unit, the number of dove-tail brace is 2 to 5; The pull bar has a plurality of third bolt holes for engaging bolts on the downwardly extending portion, and a plurality of third bolt countersunk holes are provided on the magnetic pole yoke portion (7). The third bolts pass through the third bolt countersunk holes and are assembled on the third bolt holes.

21. The permanent magnet rotor of a wind turbine according to claim 1, characterized in that: The fixing member (5) is an Ω-shaped tension rib arranged axially along the magnetic pole yoke (7); the closed portion of the Ω-shaped tension rib is assembled on the magnetic pole yoke (7); an embedded portion adapted to the Ω-shaped tension rib is provided on the pole shoe structure (3); the embedded portion is embedded in the opening of the Ω-shaped tension rib, and the pole shoe structure (3) is fixed on the magnetic pole yoke (7).

22. A permanent magnet rotor for a wind turbine according to claim 21, characterized in that: The Ω-shaped tension rib extends out of the pole shoe structure (3) in an axial direction, with a single-side extension length of 30 mm to 50 mm. The Ω-shaped tension rib is interference-fitted with the pole yoke (7), with an interference fit clearance of -0.1 mm to -0.3 mm. A notch for assembling the Ω-shaped tension rib is provided on the pole yoke (7), and the notch reserves an assembly clearance.

Images